• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.8
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• pp.1608-1614
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• 2002

This Paper presents a novel piston friction force measurement system that has characteristics of relieving the Pressure force acting on the upper surface of the liner; the system uses general rubber O-rings for combustion chamber sealing, and does not need special changes to the piston top land. The lower supporter of the floating liner increases stiffness in liner axial direction, and results in the increase of natural frequency. The upper supporter has multi-layer structure designed fer low axial stiffness and high radial stiffness. With the use of the present system, the effects of variation in clearance and piston ring tension were studied.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.25 no.3
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• pp.478-485
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• 2001

A dynamic load simulator(DLS) which can reproduce on-ground the aerodynamic hinge moment of control surface is an essential rig for the performance and stability test of aircraft actuation system. By setting up load actuator as counter acting with the control surface driving actuator and designing an appropriate force control system for load actuator, DLS can be mechanized. Obtaining an accurate mathematical model for the DLS is the first step to successfully design an aerodynamic load replicati on system. Two theoretical models are presented and tested for their validities with the experimental results, which turns out to be not successful. An alternative way of using system identification approaches in investigated to develop a good nominal model for DLS dynamics, and suitable uncertainty bounds for this nominal model are proposed with the consideration of experimental results.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.11a
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• pp.1101-1106
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• 2003

As the disk in the ODD rotates, disturbances acting on the ODD servo system generally have periodic components. Such disturbances can make the system unstable and make the controller hard to work. The repetitive controller can be the solution of the periodic disturbances by making the periodic control signals. In this paper repetitive controller is proposed that make the control signal follow the periodic disturbances. A low pass filter, which can make the system stable, is proposed by the simple stability conditions. We will show the performance of the repetitive controller in actual commercial system. Simulation and experimental results will be given as the evidences

• Proceedings of the KSR Conference
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• 2002.10a
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• pp.503-508
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• 2002

According to passengers gain and headway's contraction, railway vehicle is required quick and correct running. The importance of ATC device was increased gradually, and also is acting important role in safe train running and efficient use in this reason. Now, railway vehicle that is manufactured or is remodeled are designed to most automatic driving system, and ATC device design direction than other device of railway vehicle influences to whole system in this reason. Also, according as system becomes complicated gradually, importance of fault tracing function fur ATC device is emphasized gradually, and in this reason research about efficient fault tracing method is to act important role heightening reliability of ATC device. In this document, that analyzing about result through examination of automatic train operation system of localization model ATC device(SG-100) and application example, and do so that investigate about efficient fault Bracing.

• Design & Manufacturing
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• v.10 no.2
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• pp.39-43
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• 2016

Most of automobile parts manufactured through sheet metal forming are mass-produced by using press mold. In recent years, automation and speeding up of press lines have been expanding to maximize product productivity using a press die. The proportion of the moving time in the press line is high, and therefore requires high-speed and automated equipment for the moving process. In this paper, to provide the double-moving system can be the moving time reduction and increased productivity. Developed transport system consists of the material supply, the material feeding device and the PLC controller and the devices are positioned between each of the pressing process. In this paper, the double-moving system including developed units using a multi-axial single-acting through this reduced the C/T(cycle time) and improved the productivity.

• International Journal of Automotive Technology
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• v.7 no.3
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• pp.303-307
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• 2006

This paper presents the enhancement of vehicle stability by active geometry control suspension(AGCS) system as the world-first, unique and patented chassis technology, which has more advantages than the conventional active chassis control systems in terms of the basic concept. The control approach of the conventional systems such as active suspensions(slow active, full active) and four wheel steering(4WS) system is directly to control the same direction with acting load to stabilize vehicle behavior resulting from external inputs, but AGCS controls the cause of vehicle behaviors occurring from vehicle and thus makes the system stable because it works as mechanical system after control action. The effect of AGCS is the remarkable enhancement of avoidance performance in abrupt lane change driving by controlling the rear bump toe geometry.

• Journal of the Korean Institute of Navigation
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• v.5 no.2
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• pp.99-108
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• 1981

As far as ship's cargo handling devicesareconcerned, the derrick system has been used comprehensively in the marine. Even though there are several new devices for ship's cargo gear, such as gantry crane, jib crane adn self unloader, the derrick system, with its improved rigging method, still retains its utmost reputations among ship's owners. Therefore the method of calculating the system's militating stresses in the course of cargo operation needs to be more convenient and analytical. Here the author attempts to introduce the calculating method of stresses by means of vector analysis. The calculating method is able to analyze the stresses acting in every part of the cargo gear systems, such as union purchase, slewing or its modified system.

• The Journal of the Korea Contents Association
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• v.14 no.11
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• pp.89-101
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• 2014

The 'Biomechanics', which was devised to systematically train actor's material and medium, is evaluated as the first approach to an acting method in earnest with Stanislavsky's 'System'. Especially, due to the psycho-physical features of 'Biomechanics' that helps an actor to master a mechanism of human being such as stimulus, impulse and reaction, it was valued as an alternative for a naturalistic acting method that was excessively focused on the actor's emotional expression. However, the 'Biomechanics' is not utilized with activity in a field of actor training in Korea compared with Stanislavsky's 'The Method of Physical Action' which has a similar starting point as the psycho-physical feature. It is because of a political reason that a study for Meyerhold was officially forbidden in Russia until the mid-twentieth century. It is also because of a limit that incorporeal features of the 'Biomechanics' could not but be explained only by publications, especially translation. In this sense, as part of seeking for a new alternative of acting methods in Korea, this study will explore a possibility of applying the 'Biomechanics' to the actual actor training field through correct understanding of it.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1993.04b
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• pp.137-141
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• 1993

In the case of a boring bar, the vibration amplitude is generallylarge due to its high slenderness. The boring bat is then modelled as a cantilever with dynamic force acting at the free end and a generalized model of nonlinear continous system is obtained. The Analysis of model is conducted for the specific case with a zero side cutting edge angle. The dynamic behaviour is investigated for machining processes in which the the overlap factor of regenerative effect is considered. The vibration characteristics of boring bar depth of cut rather than feed rate in given slenderness.

• Tribology and Lubricants
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• v.14 no.3
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• pp.65-73
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• 1998

A dynamic analysis and friction loss of non-variable swash plate compressor are studied theoretically. Rotating swash plate and reciprocating pistons are modelled kinematically, and forces and torques acting on rotor-bearing system are analyzed. Then, friction losses on 4 roller bearings, 10 sliding parts between swash plate and shoes, and 10 lubricating surfaces between cylinders and pistons are calculated. On each frictional element of sliding surfaces and roller bearings, the same friction loss is obtained, respectively.